Simplifying the Session Management Using SIP Single Port

Abstract

In this paper we present the multiplexing of SIP, RTP, and RTCP streams using one network port. The motivation for this work is to improve and simplify the administration of a SIP-based VoIP session and to enhance the service reliability. This work extends the idea of RFC 5761, which deals only with the merging of RTP and RTCP protocols. The proposed approach resolves existing drawbacks of the session management, which are mainly caused by a usage of three network ports on each side of communication endpoints. Merging all three streams into a single one decreases a network footprint, therefore simplifies the session identification, which is important for a session administration, and improves a passing of firewalls and NAPT devices. As this idea is not strictly RFC compliant this paper defends these violations and depicts its solutions in a way they can be considered as IETF compliant. These statements are supported by tests in a real network environment.